Added Percent Unknown Calculations to Generating Sentences and Paragraphs
Added Percent Unknown Calculations to Generating Sentences and Paragraphs

- Used code from generating stories to add calculations to figure out the
  % of words generated that were unknowns to the generation of sentences
  and paragraphs.
- Fixed minor errors in generate_output()

ffrankies/Terry,ffrankies/tf-terry,ffrankies/tf-terry,ffrankies/Terry,ffrankies/Terry